For me, it's rogues, hands down. I have alts of pretty much every other class, some more advanced than others, but no matter what I do, if I try and get a rogue above level six it's usually a disaster. Everyone tells me that rogues are the easiest class to play, but I'm not seeing it. How is managing stealth, figuring out how to get behind pathing targets to unleash attacks, and managing combo points easy? I even tried to play one of the level 70 uberrogues from the PTR, but that didn't go any better because (big surprise) I didn't have any idea what I was doing.
I just don't get rogues. I don't get that when they talk about specs they're usually talking about what weapons to use instead of what talents they've picked half the time. I don't get that they're expected to do the most melee damage, that flies in the face of my gamer geek experience from years of tabletop play. I don't get how to use stealth propery, I don't understand how to stunlock. I'm just a hopeless case as a rogue. It doesn't help that Tauren, my second favorite race and my favorite horde side, can't be rogues.
I'd personally and with great glee batter my head against the class if I could be a stealthy manbull. And don't tell me to roll a druid, I have one of those, it's just not the same. I have rolled Night Elf, Blood Elf, Human, Orc, Troll, Undead, and Gnome rogues. It always ends the same, with a dead rogue in some zone that I never go back to again. I think I left my highest level rogue dead in the Shimmering Flats.
Come to think of it, my favorite alliance race and indeed my favorite race, can't play rogues either. No stealthy Draenei for me. As far as I'm concerned rogues are the hardest class to play. I'd play a Mage, a Warlock, anything else and do a lot better than I will on a rogue. It takes a skill set I don't seem to possess.
Any class just totally elude you? Either because of personal preference, playstyle, or a frank and baffling inability?